Key West weather by month & the best time to visit
United States · beach resort · tropical — wet & dry seasons climate
The best time to visit Key West is March — its sunniest month (Sunshine Score 92/100), with January and February close behind. Key West averages about 2,953 hours of sunshine a year. Daytime highs around 24°C / 75°F and roughly 26 mm of rain in March.
When is the best time to visit Key West?
For sunshine, the best time to visit Key West is March, then January and February. The dullest month is June (69/100, 157 mm of rain). The full month-by-month picture is in the table below.
How sunny is Key West?
Key West gets a lot of sun: around 2,953 hours a year. March (92/100) is noticeably better than June (69). It ranks #95 of 580 destinations in United States for annual sunshine, above the national median of 2,279 hours. Rain has a clear season: the wettest stretch, around August, carries about 44% of the annual 1,054 mm.
Sunshine Score by month
| Month | Score | Day high | Night low | Rain | UV | Sea |
|---|---|---|---|---|---|---|
| January | 90 | 23° / 73°F | 21° / 70°F | 33 mm | 6 | 24° / 75°F |
| February | 90 | 23° / 73°F | 22° / 72°F | 34 mm | 7 | 23° / 73°F |
| March | 92 | 24° / 75°F | 23° / 73°F | 26 mm | 9 | 26° / 79°F |
| April | 88 | 26° / 79°F | 24° / 75°F | 44 mm | 10 | 26° / 79°F |
| May | 79 | 27° / 81°F | 26° / 79°F | 96 mm | 10 | 29° / 84°F |
| June | 69 | 29° / 84°F | 28° / 82°F | 157 mm | 10 | 30° / 86°F |
| July | 73 | 30° / 86°F | 29° / 84°F | 127 mm | 10 | 31° / 88°F |
| August | 69 | 30° / 86°F | 29° / 84°F | 156 mm | 10 | 31° / 88°F |
| September | 69 | 29° / 84°F | 28° / 82°F | 177 mm | 9 | 31° / 88°F |
| October | 75 | 28° / 82°F | 27° / 81°F | 116 mm | 8 | 29° / 84°F |
| November | 88 | 26° / 79°F | 24° / 75°F | 49 mm | 6 | 27° / 81°F |
| December | 89 | 24° / 75°F | 23° / 73°F | 39 mm | 5 | 25° / 77°F |
Sea temperature in Key West by month
The sea off Key West is warmest in July at around 31°C / 88°F, and coolest in February at 23°C / 73°F. The water sits at a comfortable 21°C or warmer roughly all year round. Month-by-month sea-surface temperatures are in the Sea column of the table above.
Nearest destinations
Head-to-head
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Key West: questions and answers
What kind of destination is Key West?
Key West is a beach resort in United States with a tropical — wet & dry seasons climate — the sea reaches 31°C at its warmest and is swimmable (21°C+) year-round.
How many hours of sunshine does Key West get a year?
Key West gets about 2,953 hours of sunshine a year, at its best around March.
When is the best time to visit Key West?
The sunniest time to visit Key West is March, when the Sunshine Score peaks at 92/100 (with January and February close behind). Expect daytime highs around 24°C / 75°F.
What is the least sunny month in Key West?
June is the least sunny month in Key West, scoring 69/100 with about 157 mm of rain.
What is the sea temperature in Key West?
The sea in Key West ranges from about 23°C (February) to 31°C (July). Month-by-month sea temperatures are on this page.
How strong is the sun in Key West?
The typical midday UV index in Key West peaks around 10 (very high) in April, easing to about 5 (moderate) in December. Month-by-month midday UV values are in the UV column of the table on this page.
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